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This is a really badly asked question, but that aside, I think I know what you mean; unfortunately, that makes it off-topic, and, considering Google won't purge the personal records of someone's criminal history, I doubt you'll have much luck 'deleting' your site from the archives on the internet. There might be solutions to tell engines to ignore your site - but it is up to their implementations (and, if the site it deleted, physically, then you don't have the means anyway.)
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Grant ThomasAug 25 '11 at 14:25

The quickest way would be to sign up a webmaster account by looking at the information in the links I posted above for each search engine. Robots.txt will work to a point, but definitely don't use User-agent: * Disallow: / in .htaccess as this will stop legitimate traffic from getting to your site!!
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CliveAug 25 '11 at 15:12